Block for pulley tackles



Dec. 6, 1938. A. PqSCHAT BLOCK FOR PULLEY TACKLE'S Filed May 3, 1937 llll llll w 2 fine P/efer Jafiai [Hz/en hays.

Patented Dec. 6, 1938 UNITED STATES PATENT OFFICE Application May 3, 1937, Serial No. 140,513 In Germany May 8, 1936 2 Claims.

This invention relates to blocks for pulley tackles, more especially, but not exclusively, to blocks for tackles as used for handling life boats on board ships. Its principal object is to provide means whereby the standing part of the hoisting rope roven through the tackle blocks can be instantaneously released so as to allow kinks in the rope to be readily removed, and thereafter fixed again.

With this object in view, I suggest to fit the block, to which the standing part of the hoisting rope is to be secured, with a casing tapering in the direction of the load to which the block is to be subjected by the rope and housing a mating wedge member, said casing and said wedge member being adapted for sufficient lengthwise relative displacement to provide the required clearance for receiving the standing part of the-rope passed around the thick end of the wedge.

As far as the operation of the block is concerned, either the casing or the wedge may be slidable relative to the block. In practice, however, it is preferred to make the wedge slidable and to rigidly secure the casing to the block. In that case, the wedge may lie loosely within the casing, but preferably it has a pin and slot connection therewith, so that it cannot get lost.

In order that my invention may be well understood, I shall now proceed to describe the same with reference to the annexed drawing, on which:

Fig. 1 is a side elevation, and

Fig. 2 is a front elevation of a pulley tackle, the top block of which embodies the invention, whereas Fig. 3 is a side elevational view of a similar I tackle, the running block of which is provided with means in accordance with the invention.

The pulley tackle shown in Figs. 1 and 2 comprises a top block 4 provided with one grooved pulley 5 rotatably mounted on a pin 6, and with an eye I from which the block can be suspended.

The running block, designated by 8, houses two grooved pulleys 9, I0 rotatable about a common pin II and has an eye I2 for engaging the load to be hoisted by means of the rope I3.

Secured to the outer side of the top block 4 is a casing I4 having side walls Ma, I4b tapering in the direction towards the running block 8. This casing houses a grooved mating wedge member I5 having a curved top and a vertical slot I5a which is engaged by the pin 6. In the lowermost position of wedge member I5, the clearance between the tapering walls thereof and those of the casing I 4 is appreciably smaller, but in the uppermost position this clearance is greater than the diameter of the rope I3.

As shown, the standing or fixed part I3a of the rope I3 runs upwards between the wedge I5 and the side wall Ida of the casing I4, passes around the curved wedge top and runs downward between the wedge and the side wall MD of said casing. It will thus be understood that, whenever the running block 8 is loaded, the tension in the standing part I3a acts to forcibly clamp in the bight of said part located between the wedge and the tapering side walls of the casing I4. If, for some reason, it is desired for the standing part I3a to be disengaged, for instance, for removing kinks in the rope I3, and assuming the running block 8 to be in unloaded condition, all that is required is imparting an upward blow to the wedge I5 so as to produce clearance between the wedge and the tapering walls I411, I412 whereby the standing part I3a can be released from the casing I4.

Fig. 3 illustrates a second embodiment, in which the top block 4 and the running block 8 house three and two pulleys, respectively. The wedge I5 here is not mounted in the top block, but in the running block, in which it is fitted in the space intermediate the pulleys.

What I claim is:

1. A block for a pulley tackle, comprising in combination a pulley, a pin on which said pulley is rotatablymounted, suspension means, a casing having walls tapering in a direction away from said means, and a wedge member fitted between said walls and mating the same, said member having a slot engaged by said pin so as to be adapted for reciprocation in said direction between predetermined limits.

2. In a device of the character described a block body, at least one pulley wheel therein, a casing carried with the body laterally of the wheel and provided with opposed walls tapering toward the outer edge of the block, a wedge member fitted between the walls of the casing and mating the same and provided with a longitudinal slot, and a single pin traversing the body, pulley, casing and wedge member and serving to rotatably mount the pulley wheel in the block and slidably mount the wedge member in the casing within the limits defined by the ends of the slot.

ANE PIETER SCHAT. 

